<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            height: 300px;
            width: 600px;
            /* background: linear-gradient(180deg, #FFF, #0e41c2 50%); */
            display: grid;
            grid-template: repeat(2,auto)/repeat(3,1fr);

          


        }
        div{
            background-color: red;
        }
        .son{
            background-color: aqua;
        }
        .a{
            grid-column: span 1;
        }
    </style>
</head>
<body>
    <main class="box">
        <div>1</div>
        <div class="son">22222</div>
        <div>33333333333333</div>
        <div class="a">4444</div>
        <div class="a son">55555</div>
        <div class="a">6666</div>
        <div class="a">777777777777</div>
       
    </main>
</body>
</html>